Ceph

Add split functionality to filestore. The existing collection structure should be already in place.

Interface could be something like:

split(coll_t from, SplitFilter filter);

where

class SplitFilter {
/** * filter(filestore_key, bits, &coll) returns true iff * forall hobject x, y in from: (x.filestore_key & (1<<bits)) (y.filestore_key & (1<<bits) filestore_key) * => x, y should move to *coll.
*/
virtual bool operator()(uint32_t filestore_key, int bits, coll_t *out_coll);
}